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// EnergyPlus::Boilers Unit Tests

// Google Test Headers
#include <gtest/gtest.h>

// EnergyPlus Headers
#include <EnergyPlus/Data/EnergyPlusData.hh>
#include <EnergyPlus/DataLoopNode.hh>
#include <EnergyPlus/Plant/Branch.hh>
#include <EnergyPlus/Plant/Component.hh>

#include "../Fixtures/EnergyPlusFixture.hh"

using namespace EnergyPlus;

TEST_F(EnergyPlusFixture, Plant_Topology_Branch_MaxAbsLoad)
{
    EnergyPlus::DataPlant::BranchData b;
    b.Comp.allocate(3);

    b.Comp[0].MyLoad = 20000;
    b.Comp[1].MyLoad = 21000;
    b.Comp[2].MyLoad = 22000;
    Real64 maxLoad = b.max_abs_Comp_MyLoad();
    ASSERT_NEAR(22000, maxLoad, 0.001);

    b.Comp[0].MyLoad = 22000;
    b.Comp[1].MyLoad = 21000;
    b.Comp[2].MyLoad = 20000;
    maxLoad = b.max_abs_Comp_MyLoad();
    ASSERT_NEAR(22000, maxLoad, 0.001);

    b.Comp[0].MyLoad = 0;
    b.Comp[1].MyLoad = -21000;
    b.Comp[2].MyLoad = 22000;
    maxLoad = b.max_abs_Comp_MyLoad();
    ASSERT_NEAR(22000, maxLoad, 0.001);

    b.Comp[0].MyLoad = 0;
    b.Comp[1].MyLoad = 0;
    b.Comp[2].MyLoad = -22000; // still highest via absolute value
    maxLoad = b.max_abs_Comp_MyLoad();
    ASSERT_NEAR(22000, maxLoad, 0.001);

    b.Comp[0].MyLoad = 0;
    b.Comp[1].MyLoad = 21000;
    b.Comp[2].MyLoad = -22000;
    maxLoad = b.max_abs_Comp_MyLoad();
    ASSERT_NEAR(22000, maxLoad, 0.001);
}

TEST_F(EnergyPlusFixture, TestDetermineBranchFlowRequest)
{
    // create a branch to mess with
    DataPlant::BranchData b;

    // set up the nodes
    b.NodeNumIn = 1;
    b.NodeNumOut = 3;
    state->dataLoopNodes->Node.allocate(3);
    auto &nodeIn = state->dataLoopNodes->Node(1);
    auto &nodeMiddle = state->dataLoopNodes->Node(2);
    auto &nodeOut = state->dataLoopNodes->Node(3);

    // allocate some components
    b.TotalComponents = 2;
    b.Comp.allocate(2);
    b.Comp(1).NodeNumIn = 1;
    b.Comp(2).NodeNumIn = 2;

    nodeIn.MassFlowRateRequest = 1.0;
    nodeIn.MassFlowRateMaxAvail = 5.0;
    nodeMiddle.MassFlowRateRequest = 2.0;
    nodeMiddle.MassFlowRateMaxAvail = 5.0;
    nodeOut.MassFlowRateRequest = 3.0; // only the component inlet nodes are checked, so this shouldn't be used
    nodeOut.MassFlowRateMaxAvail = 5.0;

    // for non-series-active branch, it just takes the inlet node request
    b.controlType = DataBranchAirLoopPlant::ControlType::Active;
    Real64 flowRequest = b.DetermineBranchFlowRequest(*state);
    EXPECT_NEAR(1.0, flowRequest, 0.001);

    // for series-active branch, it takes the max of all of them
    b.controlType = DataBranchAirLoopPlant::ControlType::SeriesActive;
    flowRequest = b.DetermineBranchFlowRequest(*state);
    EXPECT_NEAR(2.0, flowRequest, 0.001);
}
